Hitachi RAS-(4-12)HRNM(2)(E) - Checking the Power Source and the Wiring Connection

11 Electrical checks of
main parts
452
SMGB0064 rev.0 - 08/2011
Operation Upper part temperature of compressor Defecting period
Cooling
Over 132 ºC 10 minutes (continuously)
Over 140 ºC 5 seconds (continuously)
Heating
Over 132 ºC 10 minutes (continuously)
Over 140 ºC 5 seconds (continuously)
Defrosting Over 132 ºC 5 seconds (continuously)
Thermistor for outdoor ambient temperature
The thermistor resistance characteristics are shown in the gure.
Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting)
The characteristics for the thermistor is the same with the value of outdoor ambient temperature thermistor as shown in
the gure.
90
80
70
60
50
40
30
20
10
0
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
Thermistor characteristics
miet temeratre 